AlitaliaMD11 From Spain, joined Dec 2003, 4068 posts, RR: 13 Posted (8 years 1 month 3 days 16 hours ago) and read 6616 times:
I took this photo today of OH-LGH on finals for 31R at JFK and it appears to me that the right engine has a longer nozzle then the left engine. The right engine looks like one of the engines on Air Europa's A330-200.
I would hazard a guess that the one with the shorter spike is rated at the same thrust, though it may not have the exact same operating characteristics of the other two. Perhaps it is less fuel-efficient at the same thrust ratings.
I do not know for certain, ask in Tech/Ops for a definitive answer.
Qantas744ER From United States of America, joined Jun 2005, 1297 posts, RR: 4
Reply 10, posted (8 years 1 month 3 days 5 hours ago) and read 5981 times:
To clear things up, the longer engine "spikes" are just a newer type of nozzle that they started using for the A330 and then also on other CF6-80 engines for the MD11. Of course not many MD11's got delivered with this nozzle but if all three engines are replaced with new ones fro GE, they will all recieve the new type of nozzle CF6-80.
IFIXCF6 From United States of America, joined Sep 2004, 108 posts, RR: 0
Reply 12, posted (8 years 1 month 2 days 15 hours ago) and read 5800 times:
The performance difference is in economy of operation. The "spike", which is properly called an exhaust nozzle centerbody was lengthened to improve fuel burn. Remember the MD11 did not do as well as promised initially in this department, and part of the cause was GE not making their target. Hence a service bulletin when a better way has been found. But do you scrap expensive, albeit somewhat less effecient parts? Your CFO has answered...short and long centerbodies on the same A/C.
No CF6-80E is installed on anything other than an A330. It has a larger fan than a -80C2.